decentralized-finance-defi

Decentralized Finance (DeFi)

This package provides distributed ledger based banking features like payments, deposits, loans and automated investment patterns.

Connect your TypeScript based projects with smart contracts on the Ethereum Blockchain by checking the following usage examples.

Usage Examples

Payments

Transfer Ether

require('dotenv').config() // this ensures process.env. ... contains your .env file configuration values
    
const { DeFiService } = require("decentralized-finance-defi")

const fromWalletAddress = process.env.SENDER_WALLET_ADDRESS
const toWalletAddress = process.env.RECEIVER_WALLET_ADDRESS
const amountInETH = 1
const senderPrivateKey = process.env.SENDER_WALLET_PRIVATE_KEY

await DeFiService.transferEther(fromWalletAddress, toWalletAddress, amountInETH, senderPrivateKey)

Deposits

Deposit Ether to Compound

You can also test this feature via the compound.finance user interface.

require('dotenv').config() // this ensures process.env. ... contains your .env file configuration values
    
const { DeFiService } = require("decentralized-finance-defi")

const amountOfEtherToBeDeposited = 1
const senderPrivateKey = process.env.SENDER_WALLET_PRIVATE_KEY
const gasLimit = 250000 // GWEI --> 0.00025 ETH --> currently January 15th 2021 about 
const web3ProviderURL = process.env.PROVIDER_URL // e.g. https://mainnet.infura.io/v3/yourinfuraprojectid

await DeFiService.depositEtherToCompound(amountOfEtherToBeDeposited, senderWalletPrivateKey, gasLimit web3ProviderURL)

Loans

Borrow Ether from Compound

You can also test this feature via the compound.finance user interface.

require('dotenv').config() // this ensures process.env. ... contains your .env file configuration values
    
const { DeFiService } = require("decentralized-finance-defi")

const amountOfDAIToBeBorrowed = 100
const walletPrivateKey = process.env.SENDER_WALLET_PRIVATE_KEY
const gasLimit = 250000
const web3ProviderURL = process.env.PROVIDER_URL // e.g. https://mainnet.infura.io/v3/yourinfuraprojectid

await DeFiService.borrowDAIFromCompound(amountOfDAIToBeBorrowed, walletPrivateKey, gasLimit, web3ProviderURL)

Redeem Asset from Compound

You can also test this feature via the compound.finance user interface.

require('dotenv').config() // this ensures process.env. ... contains your .env file configuration values
    
const { DeFiService } = require("decentralized-finance-defi")
    
const walletAddress = process.env.SENDER_WALLET_ADDRESS
const walletPrivateKey = process.env.SENDER_WALLET_PRIVATE_KEY
const gasLimit = 250000
const web3ProviderURL = process.env.PROVIDER_URL // e.g. https://mainnet.infura.io/v3/yourinfuraprojectid
const amount = 1 // redeem 1 cETH
    
await DeFiService.redeemAssetFromCompound(walletAddress,  walletPrivateKey, gasLimit, web3ProviderURL, amount)

Account Management

Get Compound Account Data

You can also test this feature via the compound.finance user interface.

const { DeFiService } = require("decentralized-finance-defi")

const walletAddress = '0xA63CD0d627c34Ce3958c4a82E6bB12F7b9C1c324'
const accountInfo = await DeFiService.getCompoundAccountData(walletAddress)

console.log(`The collateral value in ETH is: ${accountInfo.total_collateral_value_in_eth.value}.`)

Exchange Features

Swap DAI to Ether via Uniswap

You can also test this feature via the uniswap.org user interface.

require('dotenv').config() // this ensures process.env. ... contains your .env file configuration values
    
const { DeFiService } = require("decentralized-finance-defi")

const amountOfDAIToBeSwapped = 50
const walletAddress = process.env.SENDER_WALLET_ADDRESS
const walletPrivateKey = process.env.SENDER_WALLET_PRIVATE_KEY
const web3ProviderURL = process.env.PROVIDER_URL // e.g. https://mainnet.infura.io/v3/yourinfuraprojectid

await DeFiService.swapDAIToETH(amountOfDAIToBeSwapped, walletAddress, walletPrivateKey, web3ProviderURL)

Leverage Investing

Get account info from DyDx.exchange

You can also test this feature via the dydx.exchange user interface.

require('dotenv').config() // this ensures process.env. ... contains your .env file configuration values
    
const { DeFiService } = require("decentralized-finance-defi")
    
const walletAddress = process.env.SENDER_WALLET_ADDRESS

const result = await DeFiService.getDyDxPerpetualAccountBalances(walletAddress)

console.log(result)

Leverage Neural Networks

Explore FeedForward Neural Nets with Backpropagation

// This one is in experimental mode - check the code to check whether it is fine for you.
const { DeFiService } = require("decentralized-finance-defi")

DeFiService.charterATrader() // observe the console output

Crypto Currency Insights

Get Price Data with Timestamp from Coinmarketcap (API Key Required)

You can compare the results via the coinmarketcap.com user interface.

require('dotenv').config() // this ensures process.env. ... contains your .env file configuration values

const { DeFiService } = require("decentralized-finance-defi")

const pricesWithTimeStamp = DeFiService.getPriceDataWithTimeStamp(process.env.COINMARKETCAP_API_KEY)

// There will be ETH :)
console.log(pricesWithTimeStamp[1])

Distributed Ledger Insights

Get Current Gas Price Info

const { DeFiService } = require("decentralized-finance-defi")

const gasPriceInfo = await DeFiService.getGasPriceInfo()
console.log(gasPriceInfo.fastest)

Further Features

You can find many more simple and general examples in the DeFi Service file. If you are looking for anything more specific, feel free to check the corresponding folders and class definitions within the src folder.

If you have not found what you are looking for, feel free to raise an issue or even better raise a Pull Request.

Smart Contract Development

You can find some simple examples for solidity based smart contract development projects within the smart-contracts-development folder.

General Recommendations

You might also check aave.com, klopapier.exchange and compound.finance.

Distributed Domain Name Services

To provide your user interfaces in a sustainable way you might check ens.domains. If you want to try it, you might check this tutorial.

Blockchain based Deployments

For Permaweb deployments you might check argoapp.live. I tested it for a vuejs frontend project. It works pretty straight forward already.

Fund Contributions

If you see an issue in the DeFi space which you want to see solved, consider funding the solution via gitcoin.co.

Deno based DeFi

I prepared the corresponding Deno module and wait until the dependencies of the package at hand are ready for Deno resp. nest.land.

GDPR related Data Privacy

In order to comply to general data protection guidelines, you might consider providing built in transaction anonymization as a service to your users.
One option to do so is described in this tutorial leveraging tornadocash.eth.link.
Depending on your specific jurisdiction you might check tornadocash.eth.link/compliance.

Security

See Security Policy.

Protect against Postinstall Exploits

To be on the safe side even if a dependency of a dependency of a dependency .... tries to exploit the potential postinstall weak spot we recommend to adhere to the following pattern:

npm config set ignore-scripts true
npm install
npm config set ignore-scripts false

Support our Open Source Contributions

If you like our work, you might download the Brave Browser via our promotion link: https://brave.com/fan464.